add language related

Readme.md

@@ -189,10 +189,12 @@ Note: the one marked as `Live Trading` has reasonable live trading support for a
 
 - [Cvxpy](https://github.com/cvxpy/cvxpy) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/cvxpy/cvxpy/master) | `Python`, `C++` | - A Python-embedded modeling language for convex optimization problems.
 - [Numpy](https://github.com/numpy/numpy) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/numpy/numpy/main)| `Python`, `C` | - The fundamental package for scientific computing with Python
-- [Pandas](https://github.com/pandas-dev/pandas) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/pandas-dev/pandas/main) | `Python`, `Cython` | - Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more
-- [Polars](https://github.com/pola-rs/polars) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/pola-rs/polars/main)| `Rust`, `Python` | - Polars is a blazingly fast DataFrames library implemented in Rust using Apache Arrow Columnar Format as memory model.
-- [Scipy](https://github.com/scipy/scipy) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/scipy/scipy/main)| `Python`, `C` | - Fundamental algorithms for scientific computing in Python
-- [PyMC](https://github.com/pymc-devs/pymc) | `Python` | - Probabilistic Programming in Python: Bayesian Modeling and Probabilistic Machine Learning with Aesara
+- Modelling
+  - [PyMC](https://github.com/pymc-devs/pymc) | `Python` | - Probabilistic Programming in Python: Bayesian Modeling and Probabilistic Machine Learning with Aesara
+  - [Scipy](https://github.com/scipy/scipy) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/scipy/scipy/main)| `Python`, `C` | - Fundamental algorithms for scientific computing in Python
+- DataFrame
+  - [Pandas](https://github.com/pandas-dev/pandas) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/pandas-dev/pandas/main) | `Python`, `Cython` | - Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more
+  - [Polars](https://github.com/pola-rs/polars) ![GitHub last commit (branch)](https://img.shields.io/github/last-commit/pola-rs/polars/main)| `Rust`, `Python` | - Polars is a blazingly fast DataFrames library implemented in Rust using Apache Arrow Columnar Format as memory model.
 - Machine Learning
   - [Sikit-learn](https://github.com/scikit-learn/scikit-learn) | `Python`, `Cython` | - Machine learning in Python
   - [Keras](https://github.com/keras-team/keras) | `Python` | - The most user friendly Deep Learning for humans in Python